Advatrix, the Browser Hell Object

It's a BHO (Browser Helper Object), which plugs into Internet Explorer. It comes with a list of "almost 140" sites, generally search engines but also sites like Wikipedia. If the user submits a query to any of these sites, it extracts the query information from the request sent to the site and sends it to its own ad service. This service then serves targeted ads based on the query the user sent to the other site. This is pretty standard spyware behavior, although the "almost 140" sites is quite a large list.

Zdrnja checked and found that Symantec had already written up a different version of the threat and named it Trojan.Advatrix.

It doesn't uninstall these patches, it just makes them ineffective; such is the power of a BHO. But if this happens, the user is then vulnerable to attacks against the vulnerabilities, and these are two of the most exploited vulnerabilities around.

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